Revert 153131 (Histograms showed it doesn't help much)

net/http/http_transaction_unittest.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_HTTP_HTTP_TRANSACTION_UNITTEST_H_
 #define NET_HTTP_HTTP_TRANSACTION_UNITTEST_H_
 
 #include "net/http/http_transaction.h"
 
 #include <string>
@@ skipping 30 matching lines @@
                         TEST_MODE_SYNC_CACHE_START | TEST_MODE_SYNC_CACHE_READ |
                         TEST_MODE_SYNC_CACHE_WRITE)
 };
 
 typedef void (*MockTransactionHandler)(const net::HttpRequestInfo* request,
                                        std::string* response_status,
                                        std::string* response_headers,
                                        std::string* response_data);
 
 struct MockTransaction {
-  // Net error code returned as a result of starting the transaction.  If not
-  // net::OK, all response-related fields will be ignored.  Must not be
-  // ERR_IO_PENDING.
-  net::Error start_result;
-
   const char* url;
   const char* method;
   // If |request_time| is unspecified, the current time will be used.
   base::Time request_time;
   const char* request_headers;
   int load_flags;
   const char* status;
   const char* response_headers;
   // If |response_time| is unspecified, the current time will be used.
   base::Time response_time;
@@ skipping 159 matching lines @@
   bool done_reading_called_;
 };
 
 //-----------------------------------------------------------------------------
 // helpers
 
 // read the transaction completely
 int ReadTransaction(net::HttpTransaction* trans, std::string* result);
 
 #endif  // NET_HTTP_HTTP_TRANSACTION_UNITTEST_H_